Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows From Operating Activities:
Net Income	$ 11,572	$ 7,633
Provision for credit losses	3,365	3,970
Depreciation and amortization	1,054	761
Gains on sale of loans	(5,649)	(4,139)
Securities premium amortization (discount accretion), net	1,011	1,288
Origination of loans held for sale	(387,351)	(278,308)
Proceeds from sale of loans held for sale	487,225	371,777
Net increase in cash surrender value of BOLI	(94)	(97)
Increase in deferred income taxes	(1,533)	(15)
Net loss on sale of other real estate owned		61
Net gain on sale of investment securities	(23)	(153)
Stock-based compensation expense	710	1,186
Excess tax benefit from stock-based compensation	(134)	(17)
Decrease (increase) in other assets	823	(2,743)
Increase in other liabilities	(3,486)	(9,362)
Net cash provided by operating activities	107,490	91,842
Cash Flows From Investing Activities:
Increase (decrease) in interest bearing deposits with other banks and short-term investments	94	(131)
Purchases of available for sale investment securities	(54,783)	(56,763)
Proceeds from maturities of available for sale securities	12,079	10,520
Proceeds from sale/call of available for sale securities	22,148	13,920
Purchases of Federal Reserve and Federal Home Loan Bank stock	(613)	(1,133)
Proceeds from redemption of federal reserve and federal home loan bank stock	153
Net increase in loans	(60,707)	(132,432)
Proceeds from sale of other real estate owned		338
Bank premises and equipment acquired	(1,792)	(1,232)
Net cash used in investing activities	(83,421)	(166,913)
Cash Flows From Financing Activities:
Increase in deposits	(84,387)	(23,860)
(Decrease) increase in customer repurchase agreements	(8,674)	8,218
Payment of dividends on preferred stock	(141)	(141)
Proceeds from exercise of stock options	467	436
Excess tax benefit from stock-based compensation	134	17
Proceeds from employee stock purchase plan	89	144
Net cash used in financing activities	(92,512)	(15,186)
Net Decrease In Cash and Cash Equivalents	(68,443)	(90,257)
Supplemental Cash Flows Information:
Interest paid	3,775	4,622
Income taxes paid	5,875	5,950
Non-Cash Investing Activities
Transfers from loans to other real estate owned	$ 3,900	$ 365